﻿// Copyright 2004-2011 Castle Project - http://www.castleproject.org/
// 
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// 
//     http://www.apache.org/licenses/LICENSE-2.0
// 
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#region 导入名称空间

using System.Reflection;
using System.Reflection.Emit;

#endregion

namespace LightWork.DynamicProxy.Generators.Emitters.SimpleAST
{
    public class MethodInvocationExpression : Expression
    {
        protected readonly Expression[] args;
        protected readonly MethodInfo method;
        protected readonly Reference owner;

        public MethodInvocationExpression(MethodInfo method, params Expression[] args) :
            this(SelfReference.Self, method, args)
        {
        }

        public MethodInvocationExpression(MethodEmitter method, params Expression[] args) :
            this(SelfReference.Self, method.MethodBuilder, args)
        {
        }

        public MethodInvocationExpression(Reference owner, MethodEmitter method, params Expression[] args) :
            this(owner, method.MethodBuilder, args)
        {
        }

        public MethodInvocationExpression(Reference owner, MethodInfo method, params Expression[] args)
        {
            this.owner = owner;
            this.method = method;
            this.args = args;
        }

        public bool VirtualCall { get; set; }

        public override void Emit(IMemberEmitter member, ILGenerator gen)
        {
            ArgumentsUtil.EmitLoadOwnerAndReference(owner, gen);

            foreach (var exp in args)
                exp.Emit(member, gen);

            if (VirtualCall)
                gen.Emit(OpCodes.Callvirt, method);
            else
                gen.Emit(OpCodes.Call, method);
        }
    }
}